Free: Contests & Raffles.
Eastmans web site has a free video where they talk about field judging deer.
I've always been told, and correct me if I'm wrong, but that a mature mule deer buck's ears are about 20" from tip to tip, so if his horns stretch out past his ears he's at least 20" wide. I've used that many times in my Wyoming hunts to judge bucks at a distance.